Walker was a passenger in a friend’s 2005 Porsche Carrera GT and both were attending a charity event for his organization, Reach Out Worldwide, in the community of Valencia in Santa Clarita, about 30 miles north of Hollywood.

Speed was a factor in the crash, the Los Angeles County Sheriff’s Office said.

The wreck took place about 3:30 p.m. (6:30 p.m. ET), about 300 yards from the office park where the event was held. The speed limit there is 45 mph.